1. City, University of London–Optometry and Visual Sciences, London, UK
2. NIHR Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, UK
3. Centre for Public Health, Queen's University Belfast, Block B, Royal Hospital, Grosvenor Road, Belfast, Northern Ireland
4. University of Milan–ASST Santi Paolo e Carlo, Milan, Italy